Saw-tooth shaper



J. P. HEDSTROM.

SAW TOOTH SHAPER.

APPLlCATlON FILED JUNE 28,1920.

1,401,695. Patented Dec. 27, 1921,.

2 SHEETS-SHEET 1.

HEDSTR SAW TOOTH SHAPER,

APPLICATION FILED JUNE 28, I920. 1,401,695. Patented Dec. 27, 1921.

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To all whomt't 'r/zayconcern." V r I Be lt known that I, JOHN P HnDs'rRoM, a

citizen of the United States of America, re- I 'shaper adjacent one end thereoffand f siding at Big Rapids,-in the county of -Me costa and State of Michigan, have invented certain new and useful Improvements in. Saw-Tooth Shapers; and I do hereby declare the following to be a full clear, and exact description of the 'invention such as will enable others skilled in the art torwhich it appertains to make and use the same.

' This invention relates to a' saw tooth shape. After the teeth of a saw have been swaged it is desirable to shape the same so that all shall have the same shape and form, the operation of swaging ordinarily leaving the teeth uneven as toshape and form. I-tis a primary object and purpose of the present invention to make a sh'aper' forsaw teethwhiclrmay" be applied to one tooth after another on a saw the teeth of'which have been swaged, andoperate the same to engage the teeth and pressand form them to desired shape so that when the shaping operation on all of, the teeth has been accomplished, all of'the teeth bf the saw are uniwhich is of novel constrnctiom one which'is durable and one which is "particularly efficient to accomplish the work it is designed to do. The novel'constru'ctions and arrange ments of parts forattai'ning these ends will appear fully and'in detail from" the following description, taken in connection with the accompanying drawings, in which,

' Figure 1 is a side elevationof the saw tooth shaper and showing the same applied p H v y two arms "10 extend being"sliglitlyspaced apart and carrying ablock' 11 between them Fig. Q'isa plan View thereof parts of the operating handles being broken away.

Fig.3 is a fragmentary under plan View of the shaper.

Fig.4 is a vertical section taken transversely through the shaper at the point Where the operation on the saw tooth takes place.

Fig. 5 is a fragmentary longitudinal section through the shaper showing its operative relation to a saw tooth in the operation of shaping the same.

Fig. 6 is a vertical section illustrating the connection of the operating handles to the die operating screws.

' application filed J-ane as, 1920. Serial 110.392.3210. I

j at it's'free end" being 'equippedi'with for all practical purposes.

Fig." 7 is a "longitudinal section-lthereh 'o' gh7m i: 1 1

Fig. 8 is a transverse section throughthe Like*1*e ference characters? refer to'like parts in the different figures off the "draiy'iinigs. l

In the construction of the -I's'haper main. or body -member 1 is provided 1 through which af've'rtical' opening l is 'ina'deand which at each side is "formed with a depending port on l g From onendn b rgaintegral with themember 1eXtends,'the1 same Shaped Stirrup ri d p s- 's e 11 dap d o. goone. at each ""si-de'f Qf--a saw, and through fwhich at ftheir :lower ends screws 5 pass; the same" being 'ad justable 'so -"as'f'to'-"- bring *the inn e'ri ends thereof as close togetherasdesired'tof-engage against opposite side sofithe saw. An arm 6 is. connected to the upper end o'fth'e stirrup and carries a handle 7 Q at its fou'ter free end'which may be graspe'dfbythehand to. move the tool to different positions on the saw."'.Brac'kets 2 are attached to the member V 1 beloW each side 1 {amine ced far enough: apart for the" fr ee entmace of; "the saw. A "support 8' is attached to the; bar '3 on its upper side into .whichjan adjustable stop 9 isthreadedythefsameiserving to limit the 'Inojvement' of the p ting; as

will later appear.

From the: opposite of thegmemb'er 'l threads downwardly against the upper side lob of the narrowed portion 12 a distance from the end thereof, serving to adjust the same in an up or down direction as ,desired,this adj ustment being limited in scope but sufficient Two bars 15 are pivotally mounted at 7 their ends at 16 on the under side of the member 1, being-disposed in, parallelism and I limited longitudinal adjustment.

extendin toward the opening l in memher 1. 0 each of the bars 15 a bar 17 is connected by a bolt 18 so as to have a At the innerifree ends'ofbar's'17'the same are enlarged and made into die heads 19 the adjacent faces of which are properly shaped to engage opposite sides of a saw tooth and s'hapeit Wh-enthe'dies are forced toward each other.

Two screws 20 and 20 thread through the oppositesides 1 of-the member 1, one

of said screws being provided with a right handthread and the other with a left hand thread. .Eachat its outer .end is formed .with alongitudinally ribbed or corrugated vhead 21 overwhich the endsof two handle members22and 28 pass, a floating block 24L correspondingly ribbed on its inner side .bearing against the head 21 and being held .thereagainst by set screw 25. The handle member 22 at its outer end has a handle 26 attached thereto and is also formed with a laterally projecting lug 27 V which passes through a corresponding slot in the end of member 23, a washer 28iand'screw 29 threadinginto thelug serving to make the con- .nection of member 23 to member 22.

In the swaging of saw teeth such-as in- ;dicated at 31 on the saw 30, the point of the tooth is upset on itsunder inclined side and the metal appreciably thickened. This thickness of metal on the different teeth. is not uniform. To make the-same uniform and to correct any inequalities in the upsetting- 0f the metal, the teeth .are successively brought between the die heads 19, the .upper edges of the teeth coming below the end 12 of the block 11 and the point of the tooth entering the notch 12" made in the }under side of part '12 as indicated in .Fig. v5. When the tooth is entered, the handle may be .in upright position or turned to the left of upright position (referring to Fig. 1) thereby moving the screws '20..a'nd 2O outward vand permitting the spreading of .thedieheads 19. Afterthe tooth is entered the handle is turned until stopped by en- ;gagement with the stop member 9. This turns bothscrews 20 and 20 inwardlyand as a consequence the die heads are forced towardqeach other and against the -si'des of the tooth, engaging against the upset metal and forcing it to shape. The heads 19 are guided between the upper sides-'ofbrackets Q-and'the under side of the :bo'dy'member 1 and may be shaped as desired on their inner sides. The screws 5 do not bear tightly against the sides of the saw so that w en'one 'tooth is shaped it is very easy to move the tool with reference to the saw to engage with the succeeding tooth. Block 11 and bar 3 bearagainst the upper edges of theteeth at each side of the onexbeing shaped and help to properly position the tool'on the saw. Inasmuch asthe inward movements ofthe heads -19 are controlled positively by the contact of the handle members with the stop-9, it is evident'that each tooth is shaped exactly the same-as the other. The connection of the handle members 22 and 28 as describedand shown permits their spreading apart attheir inner ends as both screwsmove outward and'coming together as the screws move simultaneously inward. The opening at 1? .is a

one of said members being providedwitha slot .therethrough, a lug on .the other member entering said slot, a washerover the end vof the lug-andadjacent portions of thefirst handle member, and a screw threaded into the lug to hold the washer, substantially as described. In testimony whereof I aflix my signature.

JOHN P. HEDSTROM. 

